#include <stdio.h>
#define SIZE 10
int sump(int * start, int * end);

int main(int argc, char const *argv[])
{
	int marbles[SIZE] = {20,10,5,39,4,16,19,31,20};
	long answer;
	answer = sump(marbles, marbles+SIZE);
	printf("The total number of marbles is %ld. \n",answer);
	
	return 0;
}


int sump(int * start, int * end)
{ 
	int total =0;
	while (start<end) {
		total += *start; // 把数据元素的值加起来
		start++;		 // 让指针指向下一个元素
	}
	return total;
}